+/* These are for use during GC, on the current thread, or on prenatal
+ * threads only. */
+#if defined(LISP_FEATURE_SB_THREAD)
+#define get_binding_stack_pointer(thread) \
+ ((thread)->binding_stack_pointer)
+#define set_binding_stack_pointer(thread,value) \
+ ((thread)->binding_stack_pointer = (lispobj *)(value))
+#define access_control_stack_pointer(thread) \
+ ((thread)->control_stack_pointer)
+# if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64)
+#define access_control_frame_pointer(thread) \
+ ((thread)->control_frame_pointer)
+# endif
+#elif defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+#define get_binding_stack_pointer(thread) \
+ SymbolValue(BINDING_STACK_POINTER, thread)
+#define set_binding_stack_pointer(thread,value) \
+ SetSymbolValue(BINDING_STACK_POINTER, (lispobj)(value), thread)
+#define access_control_stack_pointer(thread) \
+ (current_control_stack_pointer)
+#else
+#define get_binding_stack_pointer(thread) \
+ (current_binding_stack_pointer)
+#define set_binding_stack_pointer(thread,value) \
+ (current_binding_stack_pointer = (lispobj *)(value))
+#define access_control_stack_pointer(thread) \
+ (current_control_stack_pointer)
+#define access_control_frame_pointer(thread) \
+ (current_control_frame_pointer)
+#endif
+
+#if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_GCC_TLS)
+extern __thread struct thread *current_thread;
+#endif
+
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+# define THREAD_CSP_PAGE_SIZE BACKEND_PAGE_BYTES
+#else
+# define THREAD_CSP_PAGE_SIZE 0
+#endif
+
+#ifdef LISP_FEATURE_WIN32
+/*
+ * Win32 doesn't have SIGSTKSZ, and we're not switching stacks anyway,
+ * so define it arbitrarily
+ */
+#define SIGSTKSZ 1024
+#endif
+
+#define THREAD_STRUCT_SIZE (thread_control_stack_size + BINDING_STACK_SIZE + \
+ ALIEN_STACK_SIZE + \
+ sizeof(struct nonpointer_thread_data) + \
+ dynamic_values_bytes + \
+ 32 * SIGSTKSZ + \
+ THREAD_ALIGNMENT_BYTES + \
+ THREAD_CSP_PAGE_SIZE)
+
+#if defined(LISP_FEATURE_WIN32)
+static inline struct thread* arch_os_get_current_thread()
+ __attribute__((__const__));
+#endif
+
+/* This is clearly per-arch and possibly even per-OS code, but we can't
+ * put it somewhere sensible like x86-linux-os.c because it needs too
+ * much stuff like struct thread and all_threads to be defined, which
+ * usually aren't by that time. So, it's here instead. Sorry */
+
+static inline struct thread *arch_os_get_current_thread(void)
+{
+#if defined(LISP_FEATURE_SB_THREAD)
+#if defined(LISP_FEATURE_X86)
+ register struct thread *me=0;
+#if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THREAD)
+ __asm__ ("movl %%fs:0xE10+(4*63), %0" : "=r"(me) :);
+ return me;
+#endif
+ if(all_threads) {
+#if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS)
+ sel_t sel;
+ struct thread *th = pthread_getspecific(specials);
+ sel.index = th->tls_cookie;
+ sel.rpl = USER_PRIV;
+ sel.ti = SEL_LDT;
+ __asm__ __volatile__ ("movw %w0, %%fs" : : "r"(sel));
+#elif defined(LISP_FEATURE_FREEBSD)
+#ifdef LISP_FEATURE_GCC_TLS
+ struct thread *th = current_thread;
+#else
+ struct thread *th = pthread_getspecific(specials);
+#endif
+#ifdef LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_TLS
+ unsigned int sel = LSEL(th->tls_cookie, SEL_UPL);
+ unsigned int fs = rfs();